package com.ls.blog.interceptor;

import com.alibaba.fastjson.JSON;
import com.ls.blog.annotation.PassToken;
import com.ls.blog.annotation.UserLoginToken;
import com.ls.blog.result.JsonResult;
import com.ls.blog.result.ResultCode;
import com.ls.blog.api.LoginService;
import com.ls.blog.api.TokenService;
import com.ls.blog.utils.ResultTool;
import com.ls.blog.utils.UserThreadLocal;
import com.ls.blog.vo.UserInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;

/**
 * @program: myblog
 * @author: lishun
 * @create: 2021-07-07 16:39
 **/

/**
 * 拦截器，判断是否有token
 */
public class AuthenticationInterceptor implements HandlerInterceptor {

    @Autowired
    private LoginService loginService;

    @Autowired
    private TokenService tokenService;

    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        String token = httpServletRequest.getHeader("Authorization");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if (!(object instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) object;
        Method method = handlerMethod.getMethod();
        //检查是否有passtoken注解，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }
        //检查有没有需要用户权限的注解
        if (method.isAnnotationPresent(UserLoginToken.class)) {
            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
            if (userLoginToken.required()) {
                UserInfo userInfo = tokenService.tokenParse(token);
                if (userInfo==null){
                    JsonResult result = ResultTool.fail(ResultCode.USER_NOT_LOGIN);
                    httpServletResponse.setContentType("application/json;charset=utf-8");
                    httpServletResponse.getWriter().println(JSON.toJSON(result));
                }
                // 验证成功后将userInfo放入threadLocal中
                UserThreadLocal.put(userInfo);
                return true;
            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest,
                           HttpServletResponse httpServletResponse,
                           Object o, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest,
                                HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
        // 用完就要删除，否则容易引起内存泄露的问题
        UserThreadLocal.remove();

    }
}
